Introduction
Integration is the process of adding up small chunks or pieces to calculate the large area. The process includes the divide disordered areas into small pieces so that we can calculate each divided area as an ordered area.
But integration & its principles are not as easy and clear as the rules for differentiation. The reason for this is that there are many possible ways to express a function.
As a result, the key to successful integration is the identification of an integrative technique to integrate the function.
Many Mathematicians work on integration to identify some short ways to identify how to solve integrals easily. In this way, they got success and discovered different types to solve the various types of integral.
Yet, in the article below are explained 4 different types of integration techniques that help you with your calculus problems.
Integration by Substitution
Integration by substitution is the most essential integration technique and is first applied to any integration problem.
When the derivative of a component of the integrand already exists in the integrand, this technique is the most appropriate to apply.
Finding the most complex part of the function that involves x as the variable is the key to,
determining the integration by substitution and is the most effective approach.
Afterward, focus on the section of the integrand that surrounds x, and compute the derivative of this integration’s part.
As a result, substitution tells when the result exists elsewhere in the integrand. It is good to use the substitution technique when the integrand can factor into something that has an “inner function” u as well as something that is more or less the derivative of u even if the constant coefficients do not exactly coincide, is acceptable. Integration by Parts Sometimes we have to solve an integration that is the result of the product of two functions.
Through the use of Integration by Parts, we may be able to integrate such products of two functions. Integration by parts technique is the inverse of the product rule of differentiation. When we are unable to use the integration by substitution technique, this method should use instead.
We have to seek an integral that is composed of functions that appear to disconnect from one another in this technique. Unless we observe the derivative of a part of the integrand already present in the integrated,
we seek for algebraic or transcendental or trig functions, or even the combination of these functions, in the integrating function.
In situations when the integrand factors into two parts that both comprise,
the variable unless integration by substitution does not apply, use integration by parts. The formula used for solving integration by parts is
Integration by Partial Fractions
When we have to integrate the rational function in mathematics, the technique of integration by partial fractions is the method that employe most often. There is no easier technique to solve the complicated rational expressions in integration.
So, to avoid this complexity, the partial fractions technique can use which simplify the rational expressions into simpler partial fractions.
A rational algebraic function or a rational function of x is a function in the form of P(x)/Q(x), where P(x) and Q(x) are both polynomials.
Generally, the integration of the rational function on the lefthand side achieve by
integrating the two integrable fractions on the righthand side.
Moreover, as long as the degree of P(x) (numerator) is greater than the degree of Q(x) (denominator), we may lower the degree of the numerator by dividing P(x) by Q(x).
Thus, when you’re asked to check a rational function that has a smaller degree in the numerator than it does in the denominator,
you should use the partial fractions approach to simplify the problem. And when the expression has a denominator that could factor out into several different linear factors.
By Trigonometric Substitution
Whenever we have trigonometric functions or ab problems in the form of completing squares,
the trigonometric substitution technique use.
Generally, there are two further divisions of trig integrals. The first case employs the functions in the form of a2 – x2 while the other case employs the function a2 + x2.
The most important elements are the sum or difference of two perfect squares, which are generally represented by a square root symbol.
Yet, trigonometric substitutions should regard as,
techniques that can be quite beneficial in the solution of a wide range of integral equations. This technique can use to a range of integrals to be effective in solving them.
Sometimes the underlying reason for the need for,
a trigonometric substitution is due to the fact that the function is best represented in a different coordinate system.
Cartesian and Rectangular coordinates are the types of coordinates most often required to solve. Polar Coordinates, so, are also quite significant in a variety of situations and given in integration problems to solve.
Some Other Methods for solving Integrals:
Some methods of integration that are important in integrals solving are as follows:

Shell Method Integration

Disc Method Integration
Now we will discuss both types below to get more from them.
Disc Method:
It is a method for calculating the volume of a solid of revolution of a solidstate material when integrating along an axis “perpendicular” to the axis of revolution and also the axis of rotation will attach with the plane of regions boundary.
As the plane of the region is attached with the axis of rotation from its boundary point, we will create the threedimensional shape and cut these revolutions of solid like a disc. And thus we will be able to find the area of that disc like a circle.
They can be tricky or different from other methods.
You can use the Shell Method calculator and Disc Method Calculator. Of course, these are some useful educational software which is helping in student’s interest in studies
Shell Method:
The Shell method is just in contrast to the disc method of integration. If the crosssection of the area is taken parallel to the axis of revolution then we will use integration by the shell method. The method for calculating the volume of a solid of revolution is Shell Method Integration.
From this, you can also see the topic from the tech log to know the Three Biggest Emerging Educational Technologies: A Brief Study